CRYOTRON:
Cryotron is a magnetically operated current Switch.
Consider superconducting material A surrounded by another
superconducting material B
Let the critical magnetic field (Hc) of material A be less
than the critical magnetic field (Hc). of B material B. Initially, let the
temperature of the whole system be below the transition temperature of two
materials (A and B).
Now at the operating temperature, the magnetic field produced by material B may exceed the critical magnetic field of A. Hence, material A becomes a normal conductor because the critical magnetic field of A is less than that of B. Moreover, B will not become a normal conductor at the critical magnetic field of A because H > Hc. Therefore the current in material A can be controlled by the current in material B. Hence, this system can act as a relay or switching element
Now at the operating temperature, the magnetic field produced by material B may exceed the critical magnetic field of A. Hence, material A becomes a normal conductor because the critical magnetic field of A is less than that of B. Moreover, B will not become a normal conductor at the critical magnetic field of A because H > Hc. Therefore the current in material A can be controlled by the current in material B. Hence, this system can act as a relay or switching element
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